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' Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364-9600 FAX (650)364 9233 <br /> rV� `Z 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX WO) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> NSR Client Project ID Lopez Property <br /> 0324 Placer Ln , Ste 200 Matrix Water <br /> Sacramento, CA 95827 <br /> ttention Alan Klein CC Sample Group 801-0883 Reported Feb 5, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst S Phillips S Phillips S Phillips S Phillips <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS013098 LCS013098 LCS013098 LCS013098 <br /> Date Prepared 01/30/98 01/30/98 01/30/98 01/30/98 <br /> Date Analyzed 01/30/98 01/30/98 01/30/98 01/30/98 <br /> instrument I D # GCHP 2 GCHP 2 GCHP 2 GCHP 2 <br /> 10, LCS % <br /> Recovery 101 99 98 98 <br /> Control Limits' 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 8010827 8010827 8010827 8010827 <br /> Date Prepared 01/30/98 01/30/98 01/30/98 01/30/98 <br /> Date Analyzed 01/30/98 01/30/98 01/30/98 01/30/98 <br /> Instrument I D # GCHP 2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery- 100 100 100 99 <br /> i Matrix Spike <br /> Duplicate% <br /> Recovery' 102 99 99 99 <br /> iRelative <br /> Difference: 20 10 10 00 <br /> i <br /> UOIA'AINALYTIgAL Please Note <br /> The LCS Is a control sample of known,interferent free matrix that Is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the DC limits for MS/MSD's are advisory only <br /> inda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory ' <br /> 8010883 ENS <3> <br />